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In recent decades, wireless doorbell systems that do not require wall wiring have become popular. The doorbell button contains a built-in radio transmitter powered by a battery. When the button is pushed, the transmitter sends a radio signal to the receiver unit, which is plugged into a wall outlet inside the building.
1 What's Included. 2  This is more than a simple doorbell button. 3  Although it operates wirelessly, it also accepts input from NO or NC contacts, like window/door contacts or other doorbell buttons. 4  The connected device can be a simple switch or in a powered circuit of less than 24 volts AC or DC.